Mapping of quantitative trait loci in pearl millet (Pennisetum glaucum (L.) R. Br.) and relating to the water stress environments

Kakkera, A and Baddam, R and Vadez, V (2017) Mapping of quantitative trait loci in pearl millet (Pennisetum glaucum (L.) R. Br.) and relating to the water stress environments. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.

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Abstract

Pearl millet, [Pennisetum glaucum (L.) R. Br.], is commonly grown in the dry environments of north west India, characterised by erratic rainfall that results in highly variable yields. Therefore, identification of plant types to a target environment is a big challenge. In this study, we are interested in traits that help improve yield when the crop is grown under control, mild, moderate and severe water stress based on the mean seasonal rain fall variations (460, 305, 252 and 139 mm in 1988) observed in dry environments of Rajasthan. We used F7 progenies of the RIL cross H 77/833–2 × PRLT 2/89–33. LG 2 was associated with grain yield components i.e. grain mass, grain number of all water stress environments, tiller number (mild water stress) and PHI (severe water stress). Stover yield and flowering time were majorly associated with LG 4 and LG 6 (mild and moderate water stress). QTL interactions revealed that under well-watered conditions, a combination of two H 77/833-2 alleles enhanced yield by 21%. Under mild water stress interaction of two PRLT 2/89–33 alleles, one H 77/833–2 allele enhanced the yield by 29%. Under severe water stress, combination of three PRLT 2/89–33 alleles enhanced yield by 8%, but when this severe stress was interrupted by rain, then interaction of two PRLT 2/89–33 alleles with one H 77/833–2 allele enhanced the yield to 18%. This QTL study and their interactions elucidated the adaptability of lines to design environment-specific ideotypes.

Item Type: Conference or Workshop Item (Paper)
Divisions: Research Program : Innovation Systems for the Drylands (ISD)
CRP: UNSPECIFIED
Uncontrolled Keywords: water stress environments, quantitative trait loci, pearl millet
Subjects: Others > Abiotic Stress
Mandate crops > Millets > Pearl Millet
Depositing User: Mr Ramesh K
Date Deposited: 13 Jun 2018 11:15
Last Modified: 13 Jun 2018 11:15
URI: http://oar.icrisat.org/id/eprint/10739
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